Parents filing wrong cases Against their son

Son aged 34 worked for 2-3 years I dubai came back. Parents had a plot earned by them. Son spent around 25 lakhs to build house. Son got married 5 years ago spent his own money for marriage. With in a year they moved to another portion in same house on the first floor separately Its a 3 floor building, parents are staying in the ground floor, son is staying on the second floor and the rest is rented and the rents are taken by the parents 7500.fir past 5 years since the building is constructed Parents have been taking care of property tax and the other utility builds are shared by tenants. Now the parents wants the son to move out of the house and pay all the taxes and other utility bills for last 3 years in 15 days. Saying that's it their hard earned money and he doesn't have anything here they have filed a harrsment case Aswell . By the way they have another son, younger one who never supported their family .got married before his elder brother and moved out of the house 6-7 years ago